Electric-arc lamp



(No Model.)

R. L. COHEN.

. ELEOTRIG ARC LAMP.

Patented Sept. 3, 1889.

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Irwenior 150561731? C'alww 5y 71,615 vitiiarncys 2 Sheets-Sheet 2.

(No Model.)

R.L.GOHEN. ELECTRIC ARC LAMP.

Patented Sept. 3, 1889.

N. PETERS, Molhhographfir. Wnuhingtun, D. C.

UNITED STATES PATENT OFFICE.

ROBERT L. COHEN, OF CAMDEN, NETV JERSEY, ASSIGNOR OF ONE-HALF TO XVILLIAM F. ANDERSON, OF PHILADELPHIA, PENNSYLVANIA.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 410,493, dated September 3, 1889.

Application filed September 27, 1888. Serial No. 286,557- (No model.)

To all whom it may concern: resented in Fig. 2, the armature D being at- Be it known that I, ROBERT L. COHEN, a tracted to the magnet D to an extent limited citizen of the United States, and a resident of by an adjustable screw M, and the plate Got Camden, New Jersey, have invented certain the armature acting upon the upper arms of Improvementsin Electric-Arc Lampspf which the levers H, so as to force the same inward 55 the following is a specification. and cause them to tightly grip the upper-car- One object of my invention is to so conbon holder F and prevent the descent of the struct the regulating devices for an arc lamp same. Vhen, however, the are between the as to adapt the same to currents of any detwo carbons becomes so long as to afiord unsired strength or intensity, and a further obdue resistance to the current, the magnet D 60 ject is toprovide a powerful operating-magis weakened to such an extent that the armanet for said regulating devices. These obture D is permitted to drop, and the effect of ,iects I attain in the manner hereinafter set this movement is the release of the upper arms forth, reference being had to the accompanyof the levers H, so that they fail to tightly r 5 ing drawings, in which grip the rod F, and hence permit the same to 65 Figure 1 is a side View of an arc lamp condrop or slide downward. The levers H are struoted in accordance with my invention. carried down with the armature D until the Figs. 2 and 3 are sectional views showing the descent is arrested by the contact of the lower regulating device in different positions, and arms of said levers with the lugs f, as shown Fig. 4. is a vertical section of the operatingin Fig. 3. As soon as the ends of the carbons 7o magnet. approach each other, however, the resistance The frame of the lamp may be constructed is lessened and the strength of the magnetD in any desired manner, the current entering is restored, so that the .armature D is again the lamp at the binding-post a, and passing attracted, thereby effecting first the closing thence through one of the side rods a and of the upper arms of the levers H upon the 7 5 bottom frame I) to the lower-carbon holder (Z, rod F of the upper-carbon holder, and then and thence in the form of the are from the the lifting of said levers and the carbon-holder lower carbon onto the upper carbon m through in order to again form an arc of the proper its holder d, rod F, and devices acting therelength.

on to the upper frame Z), thence through the The distance to which the clamping-levers 8o wrapping y of the magnet D, forming part of are permitted to drop is regulated by raising the regulating device, and thence to the hind or lowering the plate K and its stop-lugs by ing-post e at the opposite side of the frame, means of the supportin '-screws g, and the rise the rod 6 at this side being insulated from of the armature D is governed bythe adjust- 3 5 the frame at top and bottom. The rod or tube ing-screw M, which holds the armature at a 85 F, carrying the carbon-holder, passes through greater or less distance from the end of the the core of the magnetD and into the hollow magnet, so that the regulating devices can be casing F above the same. readily adapted for any desired length of arc Below the magnetD is an armature D, susand for use with currents of any desired 1n- 4o pended from which is an annular plate or ring tensity. 9

G, and through a central opening in this ring The magnet D has an outer rim m of soft project the upper arms of two levers H H, iron, and an inner tube or core m of the same which are hung to an arm I, pivoted to a material, the outer rim being cut away on base-plate J, the lower arms of these levers each side, as shown in Fig. 1, so as to constiprojecting down through an opening in said tute a horseshoe-magnet, and being connected 5 base-plate and terminating above lugs f on a to the inner core at the top by an iron ring or, plate K, supported beneath the base-plate by the wire 3 being wrapped upon said inner adj usting-screws g, adapted to threaded opentube or core, so that both said inner tube and ings in said plate. the outer rim are magnetized when the cur- The normal position of the parts is that reprent is passing through the wire, a large sur- 10o face being thus presented for attracting the arm ature D.

The core and rim may be disconnected at the bottom; but I prefer to inserta ring 10 of non-magnetizable metal, and also to line the core m with a tube p of non-magnetizable metal.

Having thus described my invention what I claim, and desire to secure by Letters Patent,

1. The combination of the upper-carbon holder, a pair of gripping-levers therefor, the upper arms of said levers having grippingjaws for engaging with the rod and having inclined or flaring outer faces, a magnet havin g an armature with closing-plate for engaging with said inclined outer faces of the levers, a carrier for said levers, and stops for tially as specified.

In testimony whereof I have sign ed my name to this specification in the presence of two subscribing witnesses.

ROBERT L. COHEN. Witnesses:

WILLIAM D. CoNNER, HARRY SMITH. 

